Clinical Study

Electromyographical Comparison of Four Common Shoulder Exercises in Unstable and Stable Shoulders

Table 3

Prone external rotation descriptive analysis with mean (Mn) and standard deviation (SD) values were reported to be divided into six arcs. The results of each Kruskal-Wallis test are presented at the end of each column for the respective muscle and arc.

0– 30– 60– 90– 60– 30–
MnSdMnSdMnSdMnSdMnSdMnSd

Supraspinatus
 Healthy9(8)14(13)21(16)16(12)8(9)5(6)
 GL10(10)19(17)29(19)18(12)11(11)14(9)
 MDI8(6)13(11)20(17)16(14)9(9)4(7)
 AI8(13)14(17)30(27)21(22)10(13)7(15)
=0.680.560.470.880.920.83
Infraspinatus
 Healthy16(6)31(9)63(22)33(12)13(5)5(2)
 GL26(11)50(19)83(19)49(16)24(12)11(9)
 MDI18(17)42(31)83(63)49(38)20(18)8(15)
 AI18(8)37(15)56(10)35(9)20(7)8(5)
=0.140.080.070.130.04*0.4
Teres major
 Healthy3(5)3(5)7(7)4(5)2(4)5(6)
 GL5(7)6(7)8(9)7(8)5(7)5(5)
 MDI1(2)2(1)3(2)1(2)1(1)2(2)
 AI4(5)7(9)8(10)6(7)6(8)6(8)
=0.30.610.450.330.170.5
Middle deltoid
 Healthy5(4)4(4)6(6)4(4)3(3)3(3)
 GL5(5)6(7)8(10)5(5)3(2)3(2)
 MDI3(3)4(4)4(3)3(2)2(2)2(2)
 AI6(5)6(6)12(9)9(6)5(4)4(4)
=0.570.860.40.220.770.39
Upper trapezius
 Healthy2(3)3(4)4(4)2(3)1(3)0(2)
 GL3(3)5(5)7(5)7(10)3(3)2(2)
 MDI3(5)5(5)7(5)4(4)5(11)2(6)
 AI3(4)5(5)8(7)6(7)3(6)2(4)
=0.850.590.140.090.360.57
Serratus anterior
 Healthy5(5)9(5)20(14)13(9)5(4)3(5)
 GL4(4)10(9)27(22)15(10)5(4)1(1)
 MDI3(4)7(6)14(10)9(7)3(3)1(2)
 AI3(3)8(8)23(25)14(15)5(6)1(2)
=0.830.580.510.60.750.73

*Indicates significant difference between groups.